Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97605bfdde7b578…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 22:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 297821b4c790a16626c8717781132989 SHA-1: 235da8fc8507f63cc2580c49bcc2a675d0a4189e SHA-256: d97605bfdde7b57895b71ea37a3f3669250c297bf46b9d0aa60868c56537ce45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to trick users into downloading further malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=download+oovoo+for+android+phones PDF link annotation
    • http://www.ondebiz.com/userfiles/file/xawidexulexoxarapajefuv.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613424c7b8ce6---rolukojan.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b10efc08a5c53f3a494585e3876a8064/66134269724.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/romabekujavizizuxebe.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/25732984378.pdfIn PDF document text
    • http://dmkert.hu/files/file/merizeminabigidugixa.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/9148679765.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614084dbe79f8---fuwazotam.pdfIn PDF document text
    • http://etre-belle.su/images/file/31280610578.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/kezogasipuvo.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/36919939536.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/7569337546140733b046c0.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/27292656129.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/sanawivow.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210915_3A7DF48251DFB7C4.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/zubezaregale.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/fikububufewiruwagowapu.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/tanavebemam.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146fff46698f---45262562116.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/pexivudejopulewufupisevu.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/fajugawewisapokomugi.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/sipevixe.pdfIn PDF document text
    • http://hbaoge.com/upload/files/rotamexusolilewome.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/lililumusupopegesi.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/lovofizurulosud.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/xuluputarutawon.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 18244 bytes
SHA-256: 15e052ec5465bb39a6bac069777ad49bde330e28ee3acf2dae37e3cc5cafb5c2
font_01_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 10648 bytes
SHA-256: 84656f5ce73403679154c983d55901a48e2813201f8865b0ec7359641e62f27f
font_02_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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